The number 1 bug bare of both the Panasonic machines is that the Open/Close button is on the opposite side to the Drive draw.
This means you end up pressing the power button instinctively when you want to change discs, so the Panasonic DMREH68 and Panasonic DMR-BW850 machine has to reboot or go through a power cycle.
This can be more than frustrating when a toddler needs to see their movie NOW.